linux-kernel - Re: [PATCH v1 0/3] console, serial8250: Disable PM and DMA ops

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Message-ID: <CAHp75Veb+zBfh=44qmMevvrfCSRYhfUMJUMArsDBtgM-F_FknQ@mail.gmail.com>
Date:   Thu, 17 May 2018 19:36:30 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v1 0/3] console, serial8250: Disable PM and DMA ops

On Thu, May 17, 2018 at 4:48 PM, Tony Lindgren <tony@...mide.com> wrote:
> * Sebastian Andrzej Siewior <bigeasy@...utronix.de> [180516 10:49]:
>> On 2018-05-16 13:17:36 [+0300], Andy Shevchenko wrote:
>> > > The output is usually short so there
>> > > shouldn't be much benefit from using it.
>> >
>> > > I remember Tony wanted runtime-pm on the kernel console, too. And he
>> > > told me explicit how to test it so that it works. Once the UART goes
>> > > into PM (down), the whole IP block can go into power save mode. The
>> > > board can be woken up by sending a character via the UART. The first few
>> > > (incoming / read) characters are lost until the IP block is up again the
>> > > frequency stable. This is known / expected.
>> >
>> > Don't consider world the OMAP only. The things more complicated if we
>> > go out of it. Which I tried to explain in the commit message of patch
>> > 2.
>>
>> I am not saying the world is OMAP only. I just tried to explain how any
>> why it got there and its purpose. I haven't NACKed it. I would believe
>> that with that information and Tony not defending his use case or
>> possible change it somehow so it is not standing in your way, Greg would
>> have enough information to go your way.
>
> The idea breaking PM seems silly to me considering that we've had
> it working for years already.

Same question  / note. World is much more complex than just being OMAP.

-- 
With Best Regards,
Andy Shevchenko